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Free Pascal - compiler

The Free Pascal Compiler is an Object Pascal compiler supporting both Delphi
and Turbo Pascal 7.0 dialects, as well as Mac Pascal dialects. It provides a
completely portable RunTime Library (RTL) available on many platforms and
compatible with Turbo Pascal, along with a platform-independent class-based
Free Component Library (FCL) adding many Delphi extensions and interfacing
with many popular open source libraries.

Extensions have been added to the language, such as function overloading,
creation and linking of shared libraries, and Delphi language extensions
including classes, exceptions, ANSI strings, and open arrays.